/****************************************************************************
**
** This file is part of the KD Chart library.
**
** SPDX-FileCopyrightText: 2001 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
**
** SPDX-License-Identifier: MIT
**
****************************************************************************/

#include "kdganttlistviewrowcontroller.h"
#include "kdganttlistviewrowcontroller_p.h"

#include <QAbstractProxyModel>
#include <QScrollBar>

#include <cassert>

using namespace KDGantt;

/*!\class TreeViewRowController
 * This is an implementation of AbstractRowController that
 * aligns a gantt view with a QListView. Provided for
 * convenience for users who want to use View with QListView
 * instead of QTreeView.
 */

ListViewRowController::ListViewRowController(QListView *lv, QAbstractProxyModel *proxy)
    : _d(new Private(lv, proxy))
{
}

ListViewRowController::~ListViewRowController()
{
    delete _d;
    _d = nullptr;
}

#define d d_func()

int ListViewRowController::headerHeight() const
{
    return d->listview->viewport()->y() - d->listview->frameWidth();
}

int ListViewRowController::maximumItemHeight() const
{
    return d->listview->fontMetrics().height();
}

int ListViewRowController::totalHeight() const
{
    return d->listview->verticalScrollBar()->maximum() + d->listview->viewport()->height();
}

bool ListViewRowController::isRowVisible(const QModelIndex &_idx) const
{
    const QModelIndex idx = d->proxy->mapToSource(_idx);
    assert(idx.isValid() ? (idx.model() == d->listview->model()) : (true));
    return d->listview->visualRect(idx).isValid();
}

bool ListViewRowController::isRowExpanded(const QModelIndex &_idx) const
{
    Q_UNUSED(_idx);

    return false;
}

Span ListViewRowController::rowGeometry(const QModelIndex &_idx) const
{
    const QModelIndex idx = d->proxy->mapToSource(_idx);
    assert(idx.isValid() ? (idx.model() == d->listview->model()) : (true));
    QRect r = d->listview->visualRect(idx).translated(QPoint(0,
                                                             static_cast<Private::HackListView *>(d->listview)->verticalOffset()));
    return Span(r.y(), r.height());
}

QModelIndex ListViewRowController::indexAt(int height) const
{
    return d->proxy->mapFromSource(d->listview->indexAt(QPoint(1, height)));
}

QModelIndex ListViewRowController::indexAbove(const QModelIndex &_idx) const
{
    const QModelIndex idx = d->proxy->mapToSource(_idx);
    return d->proxy->mapFromSource(idx.sibling(idx.row() - 1, idx.column()));
}

QModelIndex ListViewRowController::indexBelow(const QModelIndex &_idx) const
{
    const QModelIndex idx = d->proxy->mapToSource(_idx);
    if (!idx.isValid() || idx.column() != 0)
        return QModelIndex();
    if (idx.model()->rowCount(idx.parent()) < idx.row() + 1)
        return QModelIndex();
    return d->proxy->mapFromSource(idx.sibling(idx.row() + 1, idx.column()));
}
